Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26cf910504dba4c…

MALICIOUS

PDF

33.4 KB Created: 2020-08-28 09:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cc164c40d46a32987aaa81d470814b1 SHA-1: f53be3663f4e810c047fb14d017904eeb5a7c89d SHA-256: a26cf910504dba4c9ed54ce15b37ae298a38304d6edd1378630609e3256e3bbd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a "solutions manual", which is likely a pretext for delivering malicious content or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=rocket+propulsion+elements+8th+edition+solutions+manual
    • http://bunifafe.burford12.co.uk/uploads/1/3/1/3/131380942/302be91ee1bfe.pdf
    • http://wakero.pathlightministries.com/uploads/1/3/1/6/131607254/80276.pdf
    • http://files.simpleessentialsforlife.com/uploads/1/3/0/7/130739415/sezugarikirema.pdf
    • http://files.bullitteastarchery.com/uploads/1/3/2/6/132681384/1214900.pdf
    • http://zezuda.lyndsdesignhouse.com/uploads/1/3/0/7/130775997/pebade-babigeb-todoka.pdf
    • https://cdn.shopify.com/s/files/1/0461/9114/9207/files/abominable_movie_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/41894285270.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/rolimomimeko.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/bazes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/pifaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/geometric_progression_notes.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/armory_v._delamirie.pdf
    • https://cdn.shopify.com/s/files/1/0440/3570/2949/files/dubepizewubexal.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/physics_volume_2_halliday_resnick_krane.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/xugekefuvap.pdf
    • https://cdn.shopify.com/s/files/1/0434/2087/6962/files/penogabixa.pdf
    • https://cdn.shopify.com/s/files/1/0460/1354/6657/files/visalobol.pdf
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/2010_chevy_impala_car_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000467f.bin
9e9f2021f10f056c9a5cd0a218977966b7318d024fe198f6ac48ac85a530f1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x467F 5576 bytes
font_01_sfnt_off0000593c.bin
264d99a4c86cbc29e6d91323dab754217fbfcf3eeb99c5c3bde5e852f0f99d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593C 9032 bytes

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